So i took it to the garage that changed the timing belt yesterday and they could not find a fault with it. The hooked it up to a diagnostic and it turned up no faults i.e. the timing, according to the diagnostic was OK.

Not sure where to go from here. i'm thinkning I'll give it a week before giving it a full service to see if that makes a difference.

On reflection, another difference to my car now is that it doesn't start as easily as it used to (prior to the belt being changed). it chokes a bit before sparking into life. i told the garage that changed the belt about this but to be honest, I have lost confidence in them.

Any help would be greatly appreciated.